I wouldn't set a boundary that will be difficult to enforce. I know that never works out for me in parenting, and I can't imagine it going any better with another adult.
Me: 44 H: 44 Kids: 20, 16, 16, and 10 Together/Married: 22 years H announced he was emotionally detached and considering D: 4/4/16 H announced he is going to try to stay and reconnect: 5/1/16